code.delx.au - pulseaudio/blob - src/modules/module-volume-restore.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of polypaudio.
   5
   6   polypaudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as published
   8   by the Free Software Foundation; either version 2 of the License,
   9   or (at your option) any later version.
  10
  11   polypaudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with polypaudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <unistd.h>
  27 #include <assert.h>
  28 #include <string.h>
  29 #include <errno.h>
  30 #include <sys/types.h>
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33 #include <ctype.h>
  34
  35 #include <polyp/xmalloc.h>
  36
  37 #include <polypcore/module.h>
  38 #include <polypcore/core-util.h>
  39 #include <polypcore/modargs.h>
  40 #include <polypcore/log.h>
  41 #include <polypcore/core-subscribe.h>
  42 #include <polypcore/sink-input.h>
  43 #include <polypcore/core-util.h>
  44 #include <polyp/volume.h>
  45
  46 #include "module-volume-restore-symdef.h"
  47
  48 PA_MODULE_AUTHOR("Lennart Poettering")
  49 PA_MODULE_DESCRIPTION("Playback stream automatic volume restore module")
  50 PA_MODULE_USAGE("table=<filename>")
  51 PA_MODULE_VERSION(PACKAGE_VERSION)
  52
  53 #define WHITESPACE "\n\r \t"
  54
  55 #define DEFAULT_VOLUME_TABLE_FILE ".polypaudio/volume.table"
  56
  57 static const char* const valid_modargs[] = {
  58     "table",
  59     NULL,
  60 };
  61
  62 struct rule {
  63     char* name;
  64     pa_cvolume volume;
  65 };
  66
  67 struct userdata {
  68     pa_hashmap *hashmap;
  69     pa_subscription *subscription;
  70     int modified;
  71     char *table_file;
  72 };
  73
  74 static pa_cvolume* parse_volume(const char *s, pa_cvolume *v) {
  75     char *p;
  76     long k;
  77     unsigned i;
  78
  79     assert(s);
  80     assert(v);
  81
  82     if (!isdigit(*s))
  83         return NULL;
  84
  85     k = strtol(s, &p, 0);
  86     if (k <= 0 || k > PA_CHANNELS_MAX)
  87         return NULL;
  88
  89     v->channels = (unsigned) k;
  90
  91     for (i = 0; i < v->channels; i++) {
  92         p += strspn(p, WHITESPACE);
  93
  94         if (!isdigit(*p))
  95             return NULL;
  96
  97         k = strtol(p, &p, 0);
  98
  99         if (k < PA_VOLUME_MUTED)
 100             return NULL;
 101
 102         v->values[i] = (pa_volume_t) k;
 103     }
 104
 105     if (*p != 0)
 106         return NULL;
 107
 108     return v;
 109 }
 110
 111 static int load_rules(struct userdata *u) {
 112     FILE *f;
 113     int n = 0;
 114     int ret = -1;
 115     char buf_name[256], buf_volume[256];
 116     char *ln = buf_name;
 117
 118     f = u->table_file ?
 119         fopen(u->table_file, "r") :
 120         pa_open_config_file(NULL, DEFAULT_VOLUME_TABLE_FILE, NULL, &u->table_file, "r");
 121
 122     if (!f) {
 123         if (errno == ENOENT) {
 124             pa_log_info(__FILE__": starting with empty ruleset.");
 125             ret = 0;
 126         } else
 127             pa_log(__FILE__": failed to open file '%s': %s", u->table_file, strerror(errno));
 128
 129         goto finish;
 130     }
 131
 132     pa_lock_fd(fileno(f), 1);
 133
 134     while (!feof(f)) {
 135         struct rule *rule;
 136         pa_cvolume v;
 137
 138         if (!fgets(ln, sizeof(buf_name), f))
 139             break;
 140
 141         n++;
 142
 143         pa_strip_nl(ln);
 144
 145         if (ln[0] == '#' || !*ln )
 146             continue;
 147
 148         if (ln == buf_name) {
 149             ln = buf_volume;
 150             continue;
 151         }
 152
 153         assert(ln == buf_volume);
 154
 155         if (!parse_volume(buf_volume, &v)) {
 156             pa_log(__FILE__": parse failure in %s:%u, stopping parsing", u->table_file, n);
 157             goto finish;
 158         }
 159
 160         ln = buf_name;
 161
 162         if (pa_hashmap_get(u->hashmap, buf_name)) {
 163             pa_log(__FILE__": double entry in %s:%u, ignoring", u->table_file, n);
 164             goto finish;
 165         }
 166
 167         rule = pa_xnew(struct rule, 1);
 168         rule->name = pa_xstrdup(buf_name);
 169         rule->volume = v;
 170
 171         pa_hashmap_put(u->hashmap, rule->name, rule);
 172     }
 173
 174     if (ln == buf_volume) {
 175         pa_log(__FILE__": invalid number of lines in %s.", u->table_file);
 176         goto finish;
 177     }
 178
 179     ret = 0;
 180
 181 finish:
 182     if (f) {
 183         pa_lock_fd(fileno(f), 0);
 184         fclose(f);
 185     }
 186
 187     return ret;
 188 }
 189
 190 static int save_rules(struct userdata *u) {
 191     FILE *f;
 192     int ret = -1;
 193     void *state = NULL;
 194     struct rule *rule;
 195
 196     f = u->table_file ?
 197         fopen(u->table_file, "w") :
 198         pa_open_config_file(NULL, DEFAULT_VOLUME_TABLE_FILE, NULL, &u->table_file, "w");
 199
 200     if (!f) {
 201         pa_log(__FILE__": failed to open file '%s': %s", u->table_file, strerror(errno));
 202         goto finish;
 203     }
 204
 205     pa_lock_fd(fileno(f), 1);
 206
 207     while ((rule = pa_hashmap_iterate(u->hashmap, &state, NULL))) {
 208         unsigned i;
 209
 210         fprintf(f, "%s\n%u", rule->name, rule->volume.channels);
 211
 212         for (i = 0; i < rule->volume.channels; i++)
 213             fprintf(f, " %u", rule->volume.values[i]);
 214
 215         fprintf(f, "\n");
 216     }
 217
 218     ret = 0;
 219
 220 finish:
 221     if (f) {
 222         pa_lock_fd(fileno(f), 0);
 223         fclose(f);
 224     }
 225
 226     return ret;
 227 }
 228
 229 static char* client_name(pa_client *c) {
 230     char *t, *e;
 231
 232     if (!c->name || !c->driver)
 233         return NULL;
 234
 235     t = pa_sprintf_malloc("%s$%s", c->driver, c->name);
 236     t[strcspn(t, "\n\r#")] = 0;
 237
 238     if (!*t)
 239         return NULL;
 240
 241     if ((e = strrchr(t, '('))) {
 242         char *k = e + 1 + strspn(e + 1, "0123456789-");
 243
 244         /* Dirty trick: truncate all trailing parens with numbers in
 245          * between, since they are usually used to identify multiple
 246          * sessions of the same application, which is something we
 247          * explicitly don't want. Besides other stuff this makes xmms
 248          * with esound work properly for us. */
 249
 250         if (*k == ')' && *(k+1) == 0)
 251             *e = 0;
 252     }
 253
 254     return t;
 255 }
 256
 257 static void callback(pa_core *c, pa_subscription_event_type_t t, uint32_t idx, void *userdata) {
 258     struct userdata *u =  userdata;
 259     pa_sink_input *si;
 260     struct rule *r;
 261     char *name;
 262
 263     assert(c);
 264     assert(u);
 265
 266     if (t != (PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_NEW) &&
 267         t != (PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_CHANGE))
 268         return;
 269
 270     if (!(si = pa_idxset_get_by_index(c->sink_inputs, idx)))
 271         return;
 272
 273     if (!si->client || !(name = client_name(si->client)))
 274         return;
 275
 276     if ((r = pa_hashmap_get(u->hashmap, name))) {
 277         pa_xfree(name);
 278
 279         if (((t & PA_SUBSCRIPTION_EVENT_TYPE_MASK) == PA_SUBSCRIPTION_EVENT_NEW) && si->sample_spec.channels == r->volume.channels) {
 280             pa_log_info(__FILE__": Restoring volume for <%s>", r->name);
 281             pa_sink_input_set_volume(si, &r->volume);
 282         } else if (!pa_cvolume_equal(pa_sink_input_get_volume(si), &r->volume)) {
 283             pa_log_info(__FILE__": Saving volume for <%s>", r->name);
 284             r->volume = *pa_sink_input_get_volume(si);
 285             u->modified = 1;
 286         }
 287
 288     } else {
 289         pa_log_info(__FILE__": Creating new entry for <%s>", name);
 290
 291         r = pa_xnew(struct rule, 1);
 292         r->name = name;
 293         r->volume = *pa_sink_input_get_volume(si);
 294         pa_hashmap_put(u->hashmap, r->name, r);
 295
 296         u->modified = 1;
 297     }
 298 }
 299
 300 int pa__init(pa_core *c, pa_module*m) {
 301     pa_modargs *ma = NULL;
 302     struct userdata *u;
 303
 304     assert(c);
 305     assert(m);
 306
 307     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 308         pa_log(__FILE__": Failed to parse module arguments");
 309         goto fail;
 310     }
 311
 312     u = pa_xnew(struct userdata, 1);
 313     u->hashmap = pa_hashmap_new(pa_idxset_string_hash_func, pa_idxset_string_compare_func);
 314     u->subscription = NULL;
 315     u->table_file = pa_xstrdup(pa_modargs_get_value(ma, "table", NULL));
 316     u->modified = 0;
 317
 318     m->userdata = u;
 319
 320     if (load_rules(u) < 0)
 321         goto fail;
 322
 323     u->subscription = pa_subscription_new(c, PA_SUBSCRIPTION_MASK_SINK_INPUT, callback, u);
 324
 325     pa_modargs_free(ma);
 326     return 0;
 327
 328 fail:
 329     pa__done(c, m);
 330
 331     if (ma)
 332         pa_modargs_free(ma);
 333
 334     return  -1;
 335 }
 336
 337 static void free_func(void *p, void *userdata) {
 338     struct rule *r = p;
 339     assert(r);
 340
 341     pa_xfree(r->name);
 342     pa_xfree(r);
 343 }
 344
 345 void pa__done(pa_core *c, pa_module*m) {
 346     struct userdata* u;
 347
 348     assert(c);
 349     assert(m);
 350
 351     if (!(u = m->userdata))
 352         return;
 353
 354     if (u->subscription)
 355         pa_subscription_free(u->subscription);
 356
 357     if (u->hashmap) {
 358
 359         if (u->modified)
 360             save_rules(u);
 361
 362         pa_hashmap_free(u->hashmap, free_func, NULL);
 363     }
 364
 365     pa_xfree(u->table_file);
 366     pa_xfree(u);
 367 }
 368
 369